Benzene,
"But the sources you've identified do NOT - to my understanding - answer the question I asked."
On the contrary, they do exactly that.
The applicable laws tell you, as a permit holder, what you are required to do when you are stopped by an officer and you're carrying a gun. You are to voluntarily tell the officer that you are carrying a weapon and the officers have the authority to SECURE your handgun for the duration of the interaction.
Legally, seizing something and securing something are completely different concepts.
Note this on the page that I linked: "A trooper may disarm a licensee anytime he or she feels that safety is at risk. The trooper will return the gun at the end of the traffic stop when the threat to safety has passed."
Note that there is nothing about seizure in that section, nor is there anything there, or in the statutes linked from the DPS site, that say anything about you having to immediately surrender all of your firearms.
Obviously, if you're found to be breaking the law in some manner you could be arrested. At that point it is very likely that your weapon WILL be seized.
At that point the rest of your firearms collection MAY be seized, but at that point ONLY through a process that followes applicable state and federal law.
Your friend's claim, on its face, infers that ANY interaction with an officer for ANY reason at all will result in the seizure (again, different from securing) of not only the weapon you're carrying at that time but all of your weapons.
That is preposterous.
"Checking the books" is, then, a very logical step.
Why?
Because the books apply not only to you, but to the police, as well.
P.S. -- Be sure to read GC 411.206. It talks about arrest of the licensee and seizure of the handgun.
GC 411.207 talks about securing a weapon during an interaction, as well as its return to the licensee.
Note again the lack of any requirement in those sections for you to surrender all of your firearms.